Tank



FIG. 1 is a perspective view, looking from the top, of a tank showing our new design;

FIG. 2 is a first side elevational view thereof, the opposite side elevational view being identical thereto;

FIG. 3 is a top plan view thereof, the bottom plan view being identical thereto;

FIG. 4 is a first-end elevational view thereof, the opposite end elevational view being identical thereto; and,

FIG. 5 is a perspective view, looking from the bottom, of another embodiment of the design. The only difference being in the bottom view as shown. 

The ornamental design for a tank, as shown and described. 